The USS Sovereign (NCC-73811) was created after the Battle of Wolf 359 as a ship designed to defend against the Borg, similar to the USS Defiant. It featured ablative armor, regenerative shielding, bio-neural gel packs, and an enhanced deflector system. The ship was tested after the USS Pegasus was retrieved, and did poorly because of a power drain caused by the enhanced deflector system and the malfunction of the regenerative shielding system. However, another few years of work sorted out those problems, and the Sovereign successfully completed a number of assignments, most notably in the Kessok Incident in 2376.